Let's try using the formula for a chord and the formula
chord length is given by
Arc length is given by
Clyde is catching up to CeCe, so their distance along the arc is decreasing at -0.4 m/sec.
That is ds/dt = -.4.
. dr/dt is 0 because the radius does not change.
When they are 82 feet apart along the chord, then using
So, let's differentiate implicitly our chord formula.
The distance between them is decreasing at .229 m/sec.
Let's see if anyone concurs. Check my work.